JPS61174572A - Correcting device for enlargement and reduction of copy image - Google Patents

Abstract

PURPOSE:To form an image of high quality of high quality even when a trimming and a masking area are copied with variable power by controlling the exposure range of an electrostatic discharging device according to the variable power rate when a specific area of an original is copied with the variable magnification. CONSTITUTION:When the original is copied with the variable power while part of it is trimmed or masked, position coordinate data on the target area 3, i.e. X110.5 is inputted to a control circuit 21 by using a ten-key 6 and function keys 7 and data X2, Y1 and Y2, e.g. a reduction rate of x0.65 is inputted similarly. Then, the control circuit 21 calculates the exposure range by using those coordinate data and variable power rate and drives and controls an LED for electrostatic discharging on the basis of the signal. For example, when a reduced copy is taken, the turn-off width is made narrower than in life-size copying operation. Consequently, an image of high quality is formed even when a trimming and a masking area are copied with variable power.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a copy image that enables a high-quality copy image to be obtained when a trimmed image or a masking image is enlarged or reduced. The present invention relates to an enlargement/reduction correction device.

(Prior Art) An electronic copying machine exposes a charged drum to light according to document information, and then forms a visible toner image on an electrostatic latent image formed on the drum surface. J! This is a device that transfers images onto recording paper. In recent years, this type of electronic copying machine has been widely used for copying information in all fields of industry. Recent electronic copying machines are commercially available that not only automatically copy a preset number of copies, but also have a zoom function for enlarging and reducing images.

Furthermore, electronic copying machines have also appeared that are capable of trimming or masking a partial area of a document. Here, trimming is defined as leaving only a part of the document (target area) and erasing other parts, and masking is defined as erasing only part of the document (target area) and leaving other parts. . FIG. 4 is an explanatory diagram of a method for inputting position coordinate data in this type of device.

In the figure, 1 is a document table, 2 is a document placed on the document table 1, and 3 is an area (target area) in the document 2 to be trimmed or masked. 4 is the keyboard operation section,
It is composed of a display section 5, a numeric keypad 6, and a function key 7.

When the target area 3 is a simple rectangle as shown in the figure,
If the positions of any two diagonal points among the four corners A, B, C, and D (for example, point A and point C) are known, the target area 3 can be specified. Now, the coordinates of point A are (X+, Y2
), and the coordinates of point C are (X2°Y2). X1*X2
* Yt * Y2 (') Value is X.

Read from the scales in both Y directions.

After setting the trimming mode or masking mode with the function key 7, the operator first inputs coordinate data of x1 (for example, 20.5> as shown in the figure) from the numeric keypad 6 according to the display on the display unit 5, and then The function key 7 is operated to input the data into an internal control circuit (not shown).

Next, perform the same operation as in step 2 to input x2 coordinate data. After inputting the Y-direction position coordinate data, the Y-direction position coordinate data Yl and Y2 are input. After the target area is specified in this way, when the original is copied, a cropped image or (
A masking image as shown in b) is obtained.

(Problems to be Solved by the Invention) Recently, electronic copying machines have appeared that have the function of enlarging or reducing the trimming image or masking image and copying the image. Let us consider the case where a trimmed image is reduced and copied using this type of apparatus. Now, if you make a reduced copy of the cropped image shown in Figure 6 (a), it will appear in the same figure (b).
A copy image as shown in is obtained. The area 10 of the document to be trimmed is always reduced and shifted to the left in the figure during reduction copying. Therefore, in order to obtain an accurate and high-quality copy image, it is necessary to align the charge erasing area of the drum with the trimming area 10 in FIG. 6(b) in accordance with the reduction of the image.

However, in the conventional apparatus, the drum charge erasing area remains as shown in FIG. 6(b), and therefore, it is not possible to obtain an accurate and high quality reduced copy image. The situation is the same when enlarging a trimmed image and making an enlarged or reduced copy of a masking image.

The present invention has been made in view of these points, and
The purpose is to realize a copy image enlargement/reduction correction apparatus that can obtain an accurate and high-quality copy image when enlarging or reducing a copy of a trimmed image or a masking image.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, places a document on a document table, and selects an area to be trimmed or masked (target area) in the document using the numeric keys and function keys. When specifying by inputting position coordinate data and enlarging or reducing the specified target area and copying it, the exposure range of the charge erasing unit is controlled according to the coordinate movement of the target area that occurs at the time of enlargement or reduction. It is characterized by the following structure.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of the present invention. Fourth
Components that are the same as those in the figures are indicated by the same numbers. In the figure, 21 is a control circuit that performs various calculation controls, and 22 is a keyboard interface that receives operation signals from the numeric keypad 6 and function keys 7, converts them into digital data corresponding to each contact, and provides the digital data to the control circuit 21. As the control circuit 21, for example, a microcomputer is used, and as the keyboard interface 22, for example, a microcomputer or a digital circuit is used. 23 is an LED driving circuit that receives a signal from the control circuit 21; 24 is a charge erasing LED 125 driven by the output of the LED drive circuit 23; a charge erasing LED 2;
This is a drum that receives 4 exposures. Display section 5 and control circuit 2
1 are connected by a digital bus. Further, the charge erasing LED 24 is composed of multi-divided LED elements (for example, a diode array), and the number of LED elements used is, for example, about 50. The operation of the device configured as described above will be explained as follows.

First, the operator operates the numeric keypad 6 and function key 7 to set the trimming mode, and then selects the target area 3.
Position coordinate data (Xs, Yt) for specifying
, (X2, Yz) are input in the same manner as explained in connection with FIG. When the input of the position coordinate data of the target area 3 is completed, the operator operates the numeric keypad 6 and the function key 7 to set the reduced copy mode.

The reduction ratio at this time (for example, 0.65) is given to the control circuit 21 via the keyboard interface 22.

The control circuit 21 receives position coordinate data (Xt, Y2) input and stored in advance.

From (X2, Yz) and the reduction rate, the position of the trimming area at the time of reduction is calculated. When the reduction trimming area is determined, the control circuit 21 sends an exposure control signal corresponding to the reduction trimming area to the LED drive circuit 23. L.E.
The D drive circuit 23 receives the exposure control signal and drives the charge erasing LED 24.

The charge erasing LED 24 lights only the LED elements driven by the LED drive circuit 23. The illuminated charge erasing LED 24 erases the charge on the surface of the drum 25 so that toner does not adhere to the nose image portion of the charged surface of the drum 25.

Note that the above-mentioned position coordinate conversion calculation of the target area is performed using the CP of the control circuit 21 after the operator presses the copy start button.
U If you use your free time to do this, you can reduce time loss.

Next, the operation of the charge erasing LED will be explained in detail.

Before that, we will outline the configuration around the drum of an electronic copying machine. FIG. 2 is a diagram showing an example of the mechanical configuration of an electronic copying machine, and numeral 24 denotes a charge erasing section, which is the charge erasing LED described above. When the operator presses the copy start button of the function key 7, the apparatus shown in FIG. 2 starts the copying operation. After the remaining toner on the drum 30 is scraped off by a blade in the cleaning section 31', the drum 30 rotating in the direction of the arrow is corona discharged by the charging electrode 32, and the entire surface of the drum 30 is charged with a small electric charge. I am made to do so.

The charges on unnecessary portions of the charges charged by the charging electrode 32 are erased by the charge erasing LED 24.

Thereafter, the charged area of drum 30 is exposed to an optical image signal, forming an electrostatic latent image of the original image on the drum surface. The electrostatic latent image formed on the drum surface continues into the phenomenon area 33.
The toner is absorbed and converted into a visible image. The toner image on the drum surface is transferred to the recording paper by the transfer section 34, and then transferred to the drum 3.
The recording paper that is in close contact with 0 is separated. The separated recording paper is sent to the fixing roller 36 via the transport mechanism 35,
The recording paper is heated by the fixing roller 36.

The pressurized toner on the recording paper is fused to the recording paper, and the copying operation is completed.

The charge erasing LED 24 changes the exposure range in response to a drive signal for each LED element from the LED drive path 23. For example, if the extinguished range of the trimming area at the time of equal-magnification copying is Wl as shown in FIG. , the light-off range becomes narrower than in case (a). Note that the shaded area in the figure indicates the unlit area.

As described above, according to the present invention, since the extinguishing range or the lighting range of the charge erasing LED 24 can be varied according to the reduction ratio or the enlargement ratio, the charge erasing range on the drum 30 can be accurately determined. Therefore, a high quality copy image can be obtained. Note that, due to the nature of light, it bleeds to the periphery of the point of incidence. Therefore, the distance between the charge erasing LED 24 and the drum 3o is made as small as possible to reduce the influence of light blur.

In the above description, the temporary reduction copy operation in the trimming mode was taken as an example. However, the present invention is not limited to this, and can be applied not only to temporary enlarged copying in trimming mode, but also to temporary enlarged copying and temporary reduced copying in masking mode. Further, in the above explanation, the shape of the target area to be trimmed or masked is a simple rectangle, but the present invention is not limited to this.
Any shape may be used as long as the region is surrounded by line segments in the direction and the Y direction. When the shape of the target area becomes complex, it is necessary to change the lighting width or extinguishing width of the ED for charge erasing during each copying operation accordingly.

Further, in the above description, an example is given in which a multi-divided LED is used as a means for erasing the charge on the drum, but the present invention is not limited to this, and the lighting width or turning off can be changed by an external drive signal. The type of light source does not matter as long as the width can be changed.

(Effects of the Invention) As described above in detail, according to the present invention, when obtaining an enlarged copy or a reduced copy in the trimming mode or masking mode, the exposure range of the charge erasing section can be varied according to the magnification ratio. By adopting this configuration, an accurate and high-quality trimmed image or masking image can be obtained at the time of enlargement copying or reduction copying.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of the mechanical configuration of an electronic copying machine, FIG. 3 is a diagram showing the basic light state of the charge erasing section, and FIG. 5 is a diagram showing a conventional external configuration of an electronic copying machine, FIG. 5 is a diagram showing an example of copying a trimmed image and a masking image, and FIG. 6 is a diagram showing area movement during reduction copying. 1... Original table 2.11... Original 3.1
0.10-...Target area 4...Keyboard operation section 6...Numeric keypad 7...
Function key 21...1iIjIK1 circuit 22...Keyboard interface 23...LE
D drive circuit 24...LED for charge erasure 30...Drum 31...Cleaning section 32...Charging electrode 33...Developing section 34...
・Transfer section 35...Conveyance mechanism 36...Fixing roller Patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima Jigai 1 person Figure 5 (a) Figure M6 (a) (b)

Claims (1)

[Claims] Place the original on the document table, specify the area to be trimmed or masked (target area) in the original by inputting position coordinate data using the numeric keys and function keys, enlarge or reduce the specified target area, and copy. 1. A copy image enlargement/reduction correction apparatus, characterized in that the exposure range of a charge erasing section is controlled in accordance with coordinate movement of a target area that occurs during enlargement or reduction.